Apparatus for tipping metal bases with metal tips



Jan. 19,` 1943. o. JENDRESEN 2,308,659

APPARATUS FOR TIPPING METAL BASES WITH METAL TIPS Original Filed March'51, 1941 5 Sheets-Shea?I l Gaseous Triade i 'IL/7 \J //16 97 I' l IINVENTOR.

Jan- 19, 1943- o. JENDRESEN 2,308,659

APPARATUS FOR TIPPING METAL BASES WITH METAL TIPS Original Filed March31, 1941 5 Sheets-Sheet 2 `|I fr. 's

INV ENT OR.

Jam 19, 1943 o. JENDREsr-:N 2,308,659

APPARATUS FOR TIPPING METAL BASES WITH METAL TIPS Original Filed March3l, 1'941 5 Sheets-Sheet 3 [I9 107 Ff? 5 Q FZ? 314- 113d 106 'f /C l Y113fL 67 lf3 b 1N VENTOR.

Olio fend/esem www, M M lorne/s,

Jan. 19, 1943. o. JENDRESEN 2,308,659

APPARATUS FOR TIPPING METAL BASES WITH METAL TIPS original Filed Maren31, 1941 5 sheets-sneer 4 105 106 122CL l 7 \V if 1217 u? 126 66 SZ l*SZ S i 121 L 65 2\ j /g iam g y i? d? 126 128 v /s s: y 1 12 126 1by/126 1 j 61)/ 136% 1fl n 61521)d 125 131134 i 1y/H53 135 S S 11254.123 126 2`j30 12g/k F. c 8 S455 1212 1^ "l35 121/5 "134 6 7 3 INVENTOR.

9 Oo dndresm BRGM/WIM?, 3mal, M

Zio/A116115.

Jan. 19, 1943. o. JaNDREsl-:N

APPARATUS FOR TIPPING METAL BASES WITH METAL TIPS Original Filed March3l, 1941 5 Sheets-Sheet 5 INVENTOR. Oo Jendresm BYfGmQ/,f

Patented Jan. 19, 1943 UNITED STATES PATENI.v OFFICE c camisa Y armuresFoa' 'rirrma ME'rA. BASES l wrrn mirar. 'nrs i Y om widmen, muon, wis.,

poration f Wisconsin assigner to The. Wis., a cororiginar applicationnach s1. 1an, sel-a1 No.

- 386,095. Divided and this application ber 24, 1941 Sex-lalNo.A 412,098

tipping metal bases with metal tips and. more particularly toimprovements in apparatus for Septemwelding precious metal tips to pennibs.V This ap- I plication is a division of copending applicationSerial No. 386,095, filed March 31, 1941.

It isan object of the present invention to provide, in a machine of thecharacter described, an improved and exceedingly simpledevice forautomatically feeding tipping material to the tip holder of theapparatus in timed relationship with the movement of a continuouslyoperated Y base holder. Y

It is another object of the invention to provide an improved device forfeeding the tipping m-aterial in pellet form to the tip holder, whichdevice may be quickly adapted to handle pellets of diiierent sizes with'but a few easily.accomplished substitutions of parts. u

The novel features believed to be characteristic of the invention areset forth with particularity in the appended claims. The in vention,both as to its organization and method of operation, to-

gether with further objects and advantages thereof, will best beunderstood by reference to the specification taken in connection withthe accompanying drawings inwhich:

Figure 1 is a view illustrating in partially schematic form themechanical arrangement and circuit wiring of improved tipping apparatusem..

bodying the features of the present invention;

Fig. 2 is a plan view of the tipping machine schematically illustratedin Fig. 1;

Fig. 3 is a side sectional view, taken along the line 3-3 of Figeaiyhichillustrates the machine with the nib holder thereof in its tippingposition;

Fig. 3A illustrates a slightly modified arrangement oi' the nib holderand carriage therefor;

Fig. 4 is a side sectional view illustrating the machine with the nibholder in its raised or load- Referring now to the drawings, and moreparticularly to Fig. 1 thereof, the improved tipping apparatus thereVillustrated: comprises a tipping machine VI! which is. provided with astationary ltip holder II and a movable nib or base holder I2. 'I'hebase holder I2 Vis arranged to be operated by a driving motor I3 througha driving connection which includes a shaft I4, chain .sprockets I5 andI6, interconnected by an endless chain I'I, and a pair of meshing gearsVII! and I9. Preferably, the motor I3 is of the adjustable speed type,so that the tipping speed at which the machine I0 is operated may bevaried at will by an operator. This may be accomplished by providing anadjustable speed changing device, not shown, in series with the circuitbreaker 8in the input circuit of the motor. For the purpose of passingcurrent through an engaged nib and tip held by the holders vI2 and II,respectively, to produce a' fused metal connection therebetween, awelding circuit is provided which includes a six volt, direct-currentwelding generator 20 and the contacts 2| of au electromagneticallycontrolled contactor 22. The contacter 22 is operated in timedrelationship with the movement of the nib holder I2 through vtheprovision of a control circuit which includes the' contacts 23 of acarriage actuated switch 24, and the contacts 25 of a slow-to-releaserelay 26. The relay 26 is energized in timed relationship with themovement of the nib holder I2 by an impulsing device which includes a.vthree electrode gaseous discharge tube I, a second control relay 29 andtwo sets of contacts`2'la and.

2lb which are actuated by a pulsing cam 28. The cam 28 is arranged to bedriven from the 'driving gear I9 through a gear 30 which is of the samesize as the gear III.v The control grid of the tube I is normally biasednegatively substantially beyond the space current cut-oil' point bymeans of a. battery 'I which is bridged across the input electrodes ofthe tube in series with a resistor 3. In order to impress an ionizingvoltage across the input electrodes of the tube Il thereby to render thetube conductive,'a source of direct current 2 of correct voltage isprovided. A vsecond source of direct current 5 isl provided in theoutput circuit of the tube I in series with a current limiting resistorhand the winding of the relay 26, in order to energize this relay whenthe tube I is rendered conductive.` The slow-torelease period of therelay 26 is enhanced by the action of a condenser 6 connected in shunttherewith. If desired, a conventional alternating current cycle counter3l of the thermionic type may be used in lieu of the timing relay 2B andits associated equipment for controlling the contacter 22. vIn such casethe output or timing leads 32 and 33 of the cycle counter 3| arerespectively connected to the terminals 34 and 35, and the relay 26 andits associatedcontrol equipment are omitted from the apparatus.

Briefly described, and as best shown in Figs. 2, 3, 4 and 5 of thedrawings, the tipping machine IU comprises a base 36 having around itsouter edge a downwardly extending portion 31, the bottom surface ofwhich is adapted to rest upon a table or bench, and the upper side ofwhich is recessed to provide a trough 33 for catching waste material.,The front side of the base portion 31 is interrupted, as shown in Fig.11, to provide -an opening 36 into which a shallow drawer 40 may beinserted. The front of the top wall of the base 36 is cut back along theopening 39 so that tipped nibs ejected from the holder I2 are droppedinto the drawer 43.

The base 36 carries a frame 4I which supports the major portion of themoving parts of the machine. More specifically, the frame 4l is providedwith upwardly extending side members 42 and 43 and rearwardly extendingshaft supporting members 44 and 45. The frame 4I also includes atopmember 46 which extends between and is set back from the front wallof the side members 42 and 43.

The base member 36 also carries the tip holder II. More specifically,the tip holder assembly comprises a base 41, a tip holding anvil 43, apair of guide plates 49a, a slide plate 41a, and a fibre cover plate'43.'Ihe lower edges of the holder base 61 are flared to mate with thetapered edges of adjustable locking plates -56 and 5I which are clampedto the base 36 by means of assembly screws 52. Preferably, the assemblyplates 5I are eccentrically mounted in order to permit slight lateraladjustment of the tip holder assembly across the front of the basemember 36. The cylindrical anvil 43 extends through an opening providedin the holder base II and registers with an enlarged opening in themachine base member 36 throughl which it may be removed. At its upperend the anvil 43 is provided with a recess 53 which constitutes a tipreceiving pocket. A chamber 54 is provided around the upper end of theanvil 46, into which hydrogen may be introduced through any suitableinlet conduit, not shown, during the operation of the machine. The slideplate 41a is secured in a shallow channel milled in the upper side ofthe base member 41, and the right end thereof abuts the side of theanvil 43.` The upper surfaces of the plate 41a and the anvil 43 aresubstantially flush so that an unbroken surface is presented over whichthe pellets may be slid into the pocket 53. The base member I I alsosupports a tip hopper 55, having a discharge opening 56 in the lowerwall thereof, and a tip feeding device which comprises a slide 51 and anactuating plunger 53. More specifically, a centrally disposed,longitudinally extending channel is provided in the upper wall of thebase member II which receives the slide 51. This member is also providedwith a rearwardly extending portion 56 which is channeled to receive theoperating plunger 53, the two 'elements 51 and 53 being secured togetherby means of a pin 66. In order to convey tips from the discharge opening56 of the hopper 55 to the receiving pocket 53 of the anvil 43, theslide 51 is provided with a conveying pocket 6I which alternatelyregisters with the opening 56 and the pocket 53 during the operation ofthe machine. The two elements 51 and 53 of the feed mechanism are heldinassembled relationship by means hydrogen stream in the welding zone.

of the guide plates 43a which are secured to the base 41 by assemblyscrews. 'I'he cover plate 46 and the guide plates 43a are provided withoppositely disposed inwardly tapered edges which coact with the flaredbottom of the hopper 33 t0 provide a guideway for lateral movement ofthe hopper and to provide a means for securing the hopper to the top ofthe base 41. The assembly plate 49 is also provided with a flaredopening 63 which registers with the upper end of the anvil 43 andthrough which the point of a nib held by the nib holder I2 may be movedto engage a tip held by the tip receiving pocket 53. This cover plate isformed of insulating material to prevent possible shocks to the operatorhandling the machine. The flared opening through this plate is of suchsize as to concentrate the By substituting slide plates 41a and slides51 of different thicknesses and properly adjusting the height of theanvil 43 as each change is made the feeding device just described may beadapted to convey pellets of different sizes from the pellet hopper tothe receiving pocket of the anvil. For example, an exceedingly thinslide 61 and a relatively thick slide plate 41a are used in feedingpellets of .026 inch diameter to the receiving pocket of the anvil. Onthe other hand. a relatively thick slide 61 and a relatively thin slideplate 41a are used in feeding pellets of .052 inch diameter to thereceiving pocket of the anvil.

'I'he frame 4I' oi' the machine supports, for reciprocating movement ina vertical direction, a carriage 64 upon which the nib holder I2 issupported. More specifically, the nib holder I2 is slidably supported inthe barrel 66 of a retaining head 66 which is mounted for pivotalmovement with a spindle 61 between the side flanges 63a and 63D of acarriage member 63. -As best shown in Fig. 10 of the drawings, thecarriage member 63 is mounted upon a slide 63 by means of assemblyscrews 16 and is insulated therefrom through the provision of a sheet ofinsulating material 1I, ber sleeves 12 which surround the assemblyscrews 13, and insulating washers 13 which separate the screw heads fromthe slide. The edges of the slide 33 are flared to form guides whichmate with the tapered guideways 14a and 14h milled in the oppositelydisposed inner walls of the frame members 42 and 43. The inner wall ofthe slide 63 is provided with a channel 16 for receiving a rack 16 whichis mounted upon the slide 63 by means of assembly screws 11. Prom theabove explanation it will be understood that the carriage member 63 andthe head 66 are mounted for reciprocating movement with the slide 69 andare insulated from the frame and base by means of the insulating sheet1I, the insulating sleeves 12 and the insulating washers 13.

For the purpose of imparting reciprocating movement to the carriage 64,in response to rotation of the drive shaft I4, a driving connection isprovided therebetween which includes a cam 13 mounted for clockwiserotation with the shaft I4, and a reciprocating lever 13, The lever 16is mounted for rotation about a stub shaft 33, the two ends of which aresupported in openings provided in the rearwardly extending frame members44 and 45. These frame members 44 and 45 are also provided with bearings3l and 32 in which the dn've shaft I4 is journaled. The chain sprocketI5 is rigidly mounted upon the end of the main shaft I4.

The lever 16 carries at one end thereof a cam roller 35 which is mountedfor rotation with a pin 66 journaled in bearings provided in the forkedends 16a and 16h of the lever. Reciprocating movement of the slide 61between its loading and discharge positions is imparted thereto throughthe provision of a connection 81, one end of which is secured betweenthe ends 19a and 16h of the lever 19 by means of a pin I0,

and the other end of which extends between the guide plates 49a andbetween the forked ends oi the operating plunger 56. As best shown inFig. 12 of the drawings, the drive connection l1 comprises twointeriitting parts 61a and 61h with a coil spring 81o providing a.yielding connection therebetween. More speciiically, the adjacent endsof the two parts 81a and 61h are bored out to receive the coil spring61o which is held under compressive tension by means of a pin and slotconnection between the two parts. This pin and slot connection comprisesa pair of pins 61d which are secured to the walls of the part 61h onopposite sides thereof and extend through slots 61e out longitudinallyalong opposite sides of the walls defining the bore hole of the part01a. The part 61h is connected to the operating plunger 66 by means of apin Sii-which extends through registering openings provided in theforked ends ci the plunger 58 and the lower end of the part The oppositeend of the lever 19 is in the form of a'gear sector .fili having teethwhich mesh with the teeth of the rack 16 so that up and downreciprocating movement is imparted to the carriage 66 as the lever 19 isrocked about the Yshaft 80 through rotation of the cam 16. In order torotate the head 66 relative to the carriage 23 so that the nib holder |2is tilted outward as it is operated from its tipping position to itsloading position, the head 66 is provided with an arm 9| which carries aroller S2 arranged to coact with a. spring cushioned stop assembly 93.More speciiically, the arm 9| is mounted upon the head 66 by means ofassembly screws 94, and the roller 92 is rotatable with a pin 85 havingends journaled in the forked ends of the arm 9|. The cushioned stopassembly 93 is supported by the cross member 46 of the frame 6|. Brieydescribed, this assembly comprises an elongated screw 96 having its headsecured between a bearing plate 91 and an assembly plate 96 and itsshank extending through an enlarged opening drilled vertically throughthe cross member 46, and a registering opening provided in a topassembly plate 99. The roller bearing plate 91 is formed of ber or otherinsulating material in order to insulate the head 66 and the holder |2'from the frame 4|. The top plate 99 is secured to the cross member 46 bymeans of assembly screws |00. In order to bias the bearing plate 91toward its downward position, a spiral spring is provided which istelescoped over the screw 96 and lies within the side walls of a sleeve|02. One end of the biasing spring 93 abuis the under side of theassembly plate 99 vand the opposite end thereof abuts the ilanged end ofthe sleeve |02. This sleeve is journaled for sliding movement in theopening provided in the cross member 46.' For the purpose of limitingthe downward movement of the bearing plate 91, stop nuts |03 areprovided which are adjustable along the threaded shank of the screw 96to any desired position.

Clockwise rotation of the head 66 relative to the carriage member 68during movement of the nib holder l2 from its loading position to itstippingposition islimited by an adjustable stop screw |04 which isthreaded into a tapped drill hole |05 provided in the carriage member66. Downward movement of the nib holder I2 through the barrel 6l of theretaining head 66, after the holder is lowered to bring the point of anib held thereby into engagement with a tip held by the tip holder andduring a welding operation, is limited through the provision of a stopassembly which comprises a collar |06 suitably mounted upon the upperend of the holder I2 and having threaded therethrough an adjustablemicrometer screw |01, the lower end of which bears against the uppersurface of the head 66. The collar |06 also carries a copper pin |08,the lower end of which extends within and is displaced from the walls ofa mercury receiving cup |09. The purpose of providing the mercury filledcup |09 and the contacting pin |06 is to ensure an un broken electricalconnection between the nib holder l2 and the head 66, thereby to preventsparking between the engaged surfaces of these two elements. Anadditional stop assembly is provided for operating the nib holder l2automatically to eject a nib held therein as the nib holder is moved toits loading position. This assembly comprises a U-shaped bracket H6having legs which straddle the head 66 and which are secured to thecarriage member 60 by means of assembly screws iii. The base of this U-shaped member i lll is angularly disposed to lie in a plane parallel tothe longitudinal axis of the .holder when the hoider occupies itsloading position, and is provided with a centrally disposed tappedopening which is adapted to receive the threaded shank of an adjustablemicrometer screw l2. In order to ensure positive rotation of the head 66relative to the carriage member 66 during dowrnlvarcl niovementvof thecarriage 64, an elastic band H3 is provided which encircles the shank ofthe micrometer screw ||2 and the shank of a screw H4 which threaded intothe collar |06.

As an alternative to the arrangement of the carriage assemblyillustrated in Figs. 3 and 4 of the drawings, that shown in Fig. 3A maybe used. In this alternative arrangement the nib holder assembly isbiased normally to maintain the stop screw |01 in engagement with theupper surface of the head 66 by means of a coil spring ||3a. This springis anchored at its lower end to a screw 3b which is threaded into atapped opening provided in the front wall of the head 66. At its upperend, the spring ||3a is secured to the head of a screw ||3c whichextends through a hole drilled through the collar |06 and is held inplace by a pair of nuts |3d. It will be understood that by adjusting thenuts ||3d along the shank of the screw |3c, the biasing force exerted onthe nib holder assembly may be adjusted as desired. In the arrangementshown in Fig. 3A, the micrometer screw I 01 is threaded through thecollar |06 at a point about half way between the front and back of thecollar in order to provide adequate space for securing the screw 3c tothe collar. A coil spring |04a is also provided in the Fig. 3Aarrangement for biasing the head 66 toward the carriage member 66. Thisspring is anchored at its opposite ends to lugs |041: and |04c which arerespectively carried by the carriage member 68 and the head 66. Themodiiied arrangement just described and shown in Fig. 3A is quitedesirable when the machine is to be operated at high speeds, sincetheaction of the springs |I3a and |64a insures positive relative movementbetween the parts of the carriage 64 at the proper points in theoperation of the machine. Moreover, the action of the spring I34a servesto minimize any tendency of the head 33 to bounce when it is rotated toengage the stop screw |34. The machine also includes a combinationswitch actuating and stop assembly III which is fixedly mounted upon theupper end of the slide 33 in any suitable manner. This assembly includesa spacing block I I3 and a laterally extending arm |I3. The arm II3 isprovided with spaced-apart drill holes which are tapped to receive apair of adjustable micrometer screws ||3 and |20. The micrometer screw||3 coacts with the operating plunger 24a of the switch 24 to operatethis switch between its open and closed circuit positions asreciprocating movement is imparted to the carriage 34. The micrometerscrew |23, on the other hand, is arranged w engage the upper surface ofthe frame 4| and serves to determine the position in which the carriage34 is brought to rest during its downward movement.

As best shown in Figs. 6, 7, 8 and 9 of the drawings, the nib holder I2comprises a sleeve I2|, a stationary jaw |22, a movable jaw |23, anibshoe |24, a nib ejecting finger |23, and a spiral spring |23 forbiasing/the jaws |22 and |23 t0 grip a nib 3 inserted/therebetween. Morespecifically, the sleeve |2I is telescoped within the barrel 35 of thehead 33 in tight-fitting relationship therewith, and is provided with achannel I2Ia in the outer side wall thereof, within which the movablejaw |23 is free to operate. The upper end of this channel registers withan enlarged opening |21 provided in the barrel 33 of the head 33,

and these registering openings are disposed to receive the end of themicrometer screw ||2 when the holder I2 is operated to its loadingposition. The biasing spring |23 is interposed between the upper oroperating end of the movable jaw |23 and the adjacent portion of theother jaw |22, opposide ends of this spring being dispod in recesses|23a and I23b formed in the jaws |22 and |23, respectively. The upperend of the jaw |22 is drilled out to provide a shot receiving pocketI22a, and the lower end thereof is provided with a channel |23 toreceive the rectangular-shaped movable jaw |23 and with a cut-awayportion |23 for receiving the nib shoe |24. A key and slot connection isprovided between the nib shoe |24 and the jaw |22 in order to accuratelyposition the shoe on this jaw. The movable jaw |23 is pivotally mountedwithin the channel |23 of the stationaryejdaw |22 by means of a pivotpin |33 which extendsrthrough the walls defining the channel. Thestationary jaw |22 is further channeled to receive the base portion ofthe ejectlng finger |25 which is formed of fiat stock. The enlargedupper end of this finger extends within an elongated slot I3I cutthrough the movable jaw |23, and is provided with an inclined slot |32.The sides of this inclined slot form camming surfaces which coact with aroller |33 mounted within the slot I3| of the jaw |23, to reciprocatethe finger |25 between its ejecting and loading positions in response torelative movement between the two jaws.

As indicated above, the nib shoe |24 is dispod within the cut-awayportion |23 of the stationary jaw |22. 'I'his shoe is secured to thestationary jaw |22 by means of an assembly screw |34 and is providedwith a nib receiving channel |33 which is tapered and shaped to conformto the configuration of the base of a pen nib of a specific size. Theejecting finger |23 is cut away at I 33 so that the lower portionthereof may overlie the base of a nib inserted in the nib receivingchannel |33 of the shoe |24. The upper edge of this cut-away portion ofthe finger |23 is V-shaped and is arranged to be projected into a slot|31 cut into the nib shoe |24 at a point along the upper edge thereof.

In operating the nib tipping apparatus described aboge, the hopper isfirst filled with tipping material. This material is preferably sinteredosmiridium which is crushed and compressed into pellets of such sizethat each pellet may be used for tipping one pen nib. If desired, thenib holder I2 may be loaded before op-.

eration of the apparatus is initiated. To this end, the operator insertsthe base of a nib between the Jaws |22 and |23 of the nib holder wherelt is held in the channel |35 of the nib shoe |24. Before the operationof the apparatus is started the hydrogen inlet valve. not shown, isoperated to pass hydrogen into the chamber 34 of the tip holder Il. Thehydrogen, which envelopes the engaged tip and nib during each weldingoperation, precludes the formation of oxidation products which may leadto a defective union between the engaged tip and nib. The operation ofthe apparatus is initiated by actuating the switch 3 to close the inputcircuit to the driving motor I3. With this motor operating, rotarymovement is imparted to the cam 13 through the meshing gears I3 and |3,the gear sprocket I3, the chain I1, the gear sprocket I5 and the shaftI4, the direction of movement of this shaft being such that the cam 13is rotated in a clockwise direction as viewed in Figs. 1, 3 and 4 of thedrawings. Rotary movement is also imparted to the pulsing cam 23 throughthe meshing gears I3 and 33.

Each time the cam 23 is operated to bring the lobe thereof intoengagement with the cam-follower portion of the upper contact spring 2lban obvious circuit is completed for energizing the relay 23. This relay,in operating, locks up in a circuit including its contacts 23h and thecontacts 23h, and closes its contacts 29a to prepare the input circuitto the tube I. Thereafter, the

' springs 2lb are opened to interrupt the operating circuit for therelay 23, but this relay remains energized in its locking circuit. Asthe cam 23 continues to rotate, the lobe thereof momentarily closes thecontact springs 21a. This occurs an instant after the nib holder I2 islowered to its tipping position during each cycle of operation of themachine. When the contact springs 21a are moved into engagement, thevoltage of the source 2 is positively applied to the control grid of thetube across the resistor 3 to lower the negative potential of this grid.The tube I now fires or becomes ionized to permit space current flowtherethrough. Accordingly, the slow-to-release relay 23 is energizedfrom the source 5 over a circuit which includes the resistor 4 and thespace current path of the tube I. In operating, the relay 23 closes itscontacts 25 to complete the prepared operating circuit for the contactor22 in the manner explained hereinafter. At its contacts 23h, the relay23 opens the locking circuit for the relay 23, causing the latter relayto restore. At its contacts 23a, the relay 25 shortcircuits the source 5in series with the resistor 4, thereby to bring the anode and cathode ofthe tube I to the same potential for the purpose of extinguishing thespace current flow therebetween.

In this connection it will be understood that the tube I is of the typewhich is grid controlled for starting purposes only, i. e., after adischarge thereof.

' tor therethroughv is established the grid loses control. The relay 29,in releasing, opens its .contacts 29h further to interrupt its lockingcircuit. At its contacts 29a the relay 28 opens theinput or nrlng'circuit of thetube I.A This circuit may or may not have been previouslyopened at thecontact springs 21avby the earn 28, depending upon thespeed at which the machine is operating.Y In any event, this circuitcannot be recompleted until the v.

the spacecurrent :dow throughvthe tubeI and the stop assembly in theillustrated lowered position. It will be noted thatthe lower end of thenib holder I2 is'caused to follow a curvilinear thus restore the controlof the space current yiiow tothe negatively biased control gridof thetube.V The charged condenserl 8 now discharges through the winding ofthe relay 28-to retain thisrel'ay operatedfor therequired weldinginterval.V Atthe end of this interval, the relay 29 releases ,to openits contacts 2l and thus interrupt the weldacross the'sexies-connectedsource' l and resistor 28 continues to rotate, the cycleof operations just described is repeated during each revolution aboveexplanation it will be understood that the 28 and 18 are operated at thesame speed and that the 281s angular-ly disposed to close the contacts21a at exactly the same point. in each revolution offene cam 1s. It wmalso be understood that the period during which the relay 26 is operatedduring each revolution of the cam l:28 is entirely independent of thespeed ing circuit in Athe manner explainedbelow. At itsV o contacts 26o,the relay 2i opens the short-circuit Y at which -the machine isoperated. e Thus if the cam 28 is rotated to close the contact springs21a and stops in this position, the relay 26 will be operated forexactly the same interval as when the cam 28is b eing driven at maximumspeed. More-V over,v by ladjustingthe capacitance valueof the path solong as the roller 92 carried by the arm 9| engages the bearing plate91. During continued downward movement of the carriage 84 the lowerend-of the barrel thereofengages the stop screw IMto prevent further.rotation of the head I8 relative to the carriage member 88. It will benoted that the primary section b-a of thecam operating or loweringsector e is of slowly decreasing radius. Accordingly, the initialdownward movement of the carriage 84 is relatively'slowV and the head 66is rotated vinto engagement with the stop screw |84 jat a slow speedwhich prevents the head from bouncing or oscillating during -continueddownward movement thereof. .The continued downward Ymovement of thecarriage occurs while the surface of the camY sector H is traversing the`roller 85. After the head 68 and the stop screw |84' are brought intoengagement, the lower end of the nib holder I2 is moved in an exactstraight line-until the tipping POSition thereof is reached. In thisregard it will beimderstood that by adj usting the stop screw -IIMthenib holder I2 may accurately be positioned torbring the point of a nibcarried .thereby squarely into engagement with a tip heldin thereceiving pocket i9 of the tip holder I I It will also be noted thatafter the stop screw I is engaged by the barrel 85 of the head 8i, andduring `continued downward movement of .the carriage N, the roller 92 ismoved away from the bearing plate 91.

When the cam 18 is rotated so that the point e along the surface thereofengages the roller 85, the nib holder I2 occupies its tipping position.In this regard it is pointed out that during the point of the nib heldbetween the Jaws of the nib holder I2 engages the tip deposited in thereceiv- ,condenserv i, this interval may be changed as de aired. Ifdesired, the relay 28 may be of the'adinstable dashpot type in order toprovide the necessary welding interval. Assuming- Vthat the parts f thetipping machine Il occupy the positions illustrated in Fig.'

4 ofthe 'drawings lat the time the operation of the machine isinitiated, the cam roller`8l traverses the surface of the .operatingsector b'-e of the cam, which sector is of decreasing radius. Duringsuch relative movement between the cam' 18 yand the roller 85, .thecarriage Il is, by the lgravitational fforce exerted thereon, moved fromits loading 'pcsitionas'illustrated in Fig. ,4 of the drawings, to itstipping position as illustrated in 3 of the drawings. This downwardmove-I l ment of the carriage 84 and the head.` carried thereby servesto rotate the lever 19 in `a clockwise direction through the meshingengagement of the gear sector 99 with the rack 16.v The extentl whichthe lever 18 is rocked in aclockwise dir on is, of course, limited bythe engagement of lth` '\,ro1ler 85 with the surface of the cam sec- Asthe initial downward movement of the e* ege s4 proceeds, the elasticband In, acting conjunction with the gravitational pull exerted'on theeccentrically mounted head 86, serves t rotate the head and the nibholder I2 in ing pocket I8 of the tip holder II. Thereafter,

and as the head 8l continues to move downwardly, the nib base is thrustupward within the llaws .of the holder I2 thereof until the nib base isproperly positioned in the nib shoe |24, at which time the upper .edge`of the nib base may engage the V-shaped lower edge vof the electingnger |25. During further downward movement of the head 66. Also incidentto the nal downward a clockwise direction relative to the carriage 84.During'this rotation and translation of the head ,Il and the nib holderI2, the roller 92 carried by thearm'tl engages the bearing plate ,91 butthe spring I8 is of suilicient stiffness to maintain' c movement of thecarriage 64, the end of the micrometer screw I I9 engages the operatingplunger 24d of the switch 24 so that the contacts 23 V.during themovement of the cam wherein the surface of the tipping sector e-dthereof, of constant radius, engages the roller 85, no further movementof the carriage 84 occurs. The period required for such movement of thecam 18 meas- .v ures a time interval during which the tip deposited inthe receivingpocket 53 lof the tip holder II' is welded to the nibengaged thereby and held` between the jaws of the nib holder I2.Immediately after the contact springs 23 of the switch 24 are moved intoengagement to prepare the circuit for energizing the operating windingof the contactor 22 is completed, this circuit is completed at thecontacts 25 of the relay 2i in the manner explained above. When thusenergized, the contactor 22 closes its contacts 2| to complete a circuitfor passing current through the engaged tip and nib held by the tip andnib holders II and I2, respectively. 'Ihis welding circuit extends fromthe lower terminal of the direct current generator 20 by way of the head68, the mercury column in the cup I", the pin |08, the collar IIS, theJaws I 22 and I2! of the nib holder, the nib held between the jaws ofthe nib holder, the tip disposed in the receiving pocket Il of the tipholder, the frame of the machine II, and the contacts 2i to the upperterminal of the generator 2l. The current traversing this circuit causesthe engaged tip and nib to be fused at the points of contacttherebetween. Incident to the formation of this fused connection, thecontacting zones of the engaged tip and nib are momentarily heated to atemperature exceeding the melting points thereof and hence assume afluid state. When the restraining forces exerted on the nib holderassembly is thus removed, the elastic band Ill, coacting with thegravitational force exerted on the nib holder assembly, pulls thisassembly downward until the lower end of the stop screw III`I engagesthe upper surface of the head It. The extent of this movement isexceedingly small and the movement is only permitted to ensure a perfectbond between the engaged tip and nib.

At the end of the welding interval, as measured by the release period ofthe relay 2l, this relay restores and opens its contacts 25 to interruptthe circuit for energizing the operating winding of the contactor 22.The contactor 22l now releases and opens its contacts 2i to interruptthe above-traced welding circuit, whereby the iiow of current throughthe engaged nib and tip is arrested. In this regard it is pointed outthat the operation of the camming element 2l is so timed, throughoperation of the gears I! and Il, that the contacts 21a are moved intoengagement to cause the operation of the relay 2i immediately after theswitch 24 is operated by the screw III to close the contacts 2l. Hencethe welding period is in each instance determined by the release periodof the slow-to-release relay 26. and this is true regardless of thespeed at which the apparatus is operated.

Shortly after the welding circuit is opened by the contactor 22 in themanner explained above, and during continued rotation of the cam 1I, theroller I engages the surface of the retracting sector d-c of the cam.This surface is of rapidly increasing radius and, accordingly, the lever'IS is rocked in a counterclockwise direction to raise the carriage 8l.During the initial upward movement of the carriage 6l to move the tippednib out of engagement with the tip holder II, the head it retains itslowered position. As the cam 18 continues to rotate, the carriage 64 iselevated to a position such that the roller I2 engages the bearing plate91 of the stop assembly 93. During the continued upward movement of thecarriage il, vertical movement of the roller 92 is arrested so that thehead Si is rotated in a counterclockwise direction relative to thecarriage member 6I. Thus, during the final portion of the period whenthe surface of the cam sector d-c traverses the roller l5 the head il isrocked to bring the nib holder I2 back to its loading position. Incidentto the nal movement of the head Il the operating end of the movable JawI2) engages the end of the stop screw I I2 to eject the nib held betweenthe iaws of the holder I2 in the manner explained'immediately below. Asthe cam 1I continues to rotate, the surface of the loading sector c-bthereof, which is of constant radius, traverses the cam roller Duringsuch rotation of the cam the carriage remains in its raised position andthe nib holder I2 is held in its loading position. It will be noted thatthe extent of the sector c-b of the cam 1l determines the period duringwhich the nib holder I2 is held in its loading position. Consequently,this sector is made of sufficient size that, when the machine isoperated at its maximum speed. the holder I! is retained in its loadingposition for an adequate time interval to permit easy Insertion of a pennib between the Jaws thereof. From this point on the operations justdescribed are cyclically repeated during each revolution of the cam il.y

From the above explanation it will be understood that during the iniualmovement of the carriage il to lower the nib holder I2 from its tippingposition toits loading position, the shock of the engagement of the headIl with the stationary parte of the frame II is minimised through theaction of the cam 1l to lower the carriage 04 at a slow speed, therebyto prevent any tendency for the head l. to bounce or oscillate as thetip holder I2 is moved into'its tipping position. It will further beapparent that by suitable adjustment of the micrometer screws II'I andI2l the downward movement of the carriage Il may be accurately adjustedso that the movement of the nib holder I2 which occurs aftertheweldingoperationisstartedislimitedtoa `fixed predetermined valuewhich may be varied for nibs and tips of different sizes. Moreover theprovision of the adjustable stop screw I I! enables the movement of theJaw |28, which occurs incident to the nnal retracting movement of theholder I2, accurately to be adjusted.

As indicated in the above description, the movable parts of thecushioned stop-assembly are normally maintained in the illustratedlowered positions thereof during the operation of the machine. If,however, the head Il and the carriage member il should inadvertently belocked against relative movement, or the movement of the head toward itsloading position should accidentally be blocked, the movable elements M,l1, il, Il! and Ill of this assembly are moved upward with the carriageIl as the carriage is elevated to its raised position. Careless handlingof the machine may cause the movement oftheheadtobeblockedinthemanneriust referred to. Thus, the nib holderassembly oomprising the two Jaws |22 and III may inadvertently betelescoped upward through the sleeve I2I to bring the pivot point Illopposite the end o f the stop screw II! during final movement of thehead I6 toward its` loading position. Should this occur, the rotation ofthe head relative to the carriage member Cl is blocked by the screw II!before completion and with the free end of the arm II in a slightlyelevated position. In such case, however, the travel permitted betweenthe moving parts of the cushioned stop assembly I and the frame of themachine, permits the upward movement of the carriage Il to be completedwithout exerting any excessive strain on any part of the machine. Thus,the cushioned stop assembly acts to safeguard the machine in which thenib holder I2 is loaded and the nibs r inserted therein areautomatically ejected, it will be noted that when .the holder occupiesits loading position, as illustrated in Fig. 8 of the drawings. the nibej ecting finger |25 occupies its downward'or electing position and thejaws |22 and |23 are open. With the nib holder in this position thetriangular-shaped base of a nib 8 may be inserted between the Jaws inthe channel |85 of the nib shoe |24 until the upper edge thereof engagesthe V-shaped edge of the finger |25. The nib is held between theangularly extending sides of the nib shoe by the machine operator untilthe jaws |22 and |23 are closed to grip the nib, at which time the nibmay be released by .the machine operator. With the nib inserted in thenib shoe, the movable jaw |23 is operated to clamp the nib 5 against thejaw |22 during the initial movement'of the holder I2 away from itsloading position. Thus, during the initial downward movement of thecarriage 54, the head 88 is tilted' inward in the manner explainedabove,

so that the end of the stop screw ||2 is gradu ally disengaged from theoperating end of the movable jaw |23. As this occurs, the spring |28operates to close the jaw |23 until the nib l8 is firmly gripped betweenthis jaw and the stationary jaw |22.' During this relative movementbetween the jaws |22 and |23 the roller |33 coacts with the uppercamming surface of the slot |32 to translate the ejecting linger 25upwardly so that the lower V-shaped edge thereof is moved out ofengagement with the upper edge of the base of the nib 9. The parts ofthe nib holder i2 remain in this position until the nib holder I2approaches its tipping position to bring the point of the nib il intoengagement with the tip pellet disposed in the receiving pocket 53 ofthe tip holder ii. When this occurs, the movement of the nib 9 isstopped but the weight of the nib holder assembly causes the downwardmovement of this assembly to continue so .that the nib 8 is forcedupward in the channel |35 of the nib shoe |24 in the manner explainedabove. The parts of the nib holder and the nib 8 remain in this positionuntil the nib holder is again retracted to its loading position. Duringthe iinal portion of the retracting movement, the operating end of themovable jaw |23 is again moved into engagement with the end of the stopscrew ||2 so that this jaw is rocked about its pivot pin |35 against thebias of the spring |25 to open the two jaws and .thus release the nib 8from the gripping force exerted by the jaws. Incident to this relativemovement between the two jaws, the camroller |33, operating inconjunction with the lower surface of the inclined slot |32, forces theejecting finger |25 downward. Since the lower V-shaped edge of thisfinger is at this time in engagement with the upper base edge of the nib9 the nib is forcibly ejected from the channel |35 of the nib shoe |24and is expelled into the nib receiving drawer 48 of the machine. 'I'husit will be seen that the only operation required on the part of theoperator isv that of feeding nibs to the nib holder i2, such nibs beingautomatically ejected from the holder after the tipping operation iscompleted.

In adapting the machine i8 for use in tipping pen nibs of differentsizes, the only required changes in the machines are vthe substitutionof ejecting fingers |25 and nib shoes |24 of diiierent sizes. Theseelements are made up in sets, the sizes thereof varying in certaindimensions according .to the size of the nibs with which they are to 'beused. Thus, for a large nib having a relatively wide base portion and ofrelatively long length. the nib shoe |24 used for receiving the nib isprovided with a relatively wide nib receiving channel |35, and thelength of the cut-cut portion |35 of the electing er |25 is proportionedto accommodate the lennlsikof the nib. For 1a short nib, on the otherhand, the shoe |24 provided to receivethe nib base is provided with anib receiving channel |35 ci correspondingly smaller dimensions and thelength of the cut-out portion-|35 of the ejecting finger |25 iscorrespondingly reduced to accommodate the decreased length of the nib.The different ejecting nger and nib shoe sets are changed by withdrawingthe nib holder assembly from the sleeve |2| and knocking out the pivotpin |38 to remove the jaw |23. After this is done, the substitution mayreadily be eiiected, after which the assem bly is rebuilt and againinsrtedin the sleeve |2|. From the above explanation, it will beapparent that by using nib shoes and electing fingers. in sets the nibholder i2 may be altered at will to receive nibs and accommodate nibs ofdiil'erent sizes. In order to adjust the weight of .the nib holderassembly, as supplemented by the action of the elastic band ||3, to thetipping of nibs of diil'erent sizes, the pocket |22a may be loaded withshot to provide the required compressive force on a tip engaged by thepoint of a nib held between the jaws of the nib holder |2.

It is pointed out above that the -tip pellets are automatically fed tothe tip receiving pocket 53 of the tip holder from the hopper 55 intimed relationship with the movement of the nib holder I2. In thisregard it will be noted that during the portion of each revolution ofthe cam 18 when the surface of the operating sector b-e of the camtraverses the roller to permit the lever 18 to be rocked in a clockwisedirection, the connection 81 pulls the operating plunger 58 of the tipfeeding device to the left, so that the slide 51 is withdrawn from thetip discharge position illustrated in Fig. 4 of the drawings. The extentof this movement is such that the conveying pocket 6| of the slide 51 ismoved into'registry with the discharge opening 56 of the hopper 55coincident with the movement of the cam 18 to bring the surface point ethereof into engagement with the cam roller 85. Thus, the conveyingpocket 5| is loaded with a pellet through the opening 56 in the base ofthe hopper 55 during the portion of the cam movement when the surface ofthe sector e-d eng-ages the roller 85. During continued movement of thecam 1.8, and while the surface of the retracting sector d-c of the camengages the roller 85, the lever 19 is rocked in a eciun-terclockwisedirection to move the nib holder |"2 from its tipping posi-tion to itsloading position, in the manner explained above. Incident to thismovement, the lever 19, acting through the connection 81, operates theplunger 58 and connected slide 51 to the right, so that the dischargeopening 55 of the hopper 55 is closed. 'I'he pellet disposed in theconveying pocket 6| of the slide 51 is slid over the upper surf-ace ofthe base 41 until it is brought into registry with the Itip receivingpocket 53 of the anvil 48.' This occurs slightly before the surfacepoint c of the cam 18 is moved to engage the roller 85, i. e., shortlybefore the nib holder I2 is moved to its loading. position. When .thesetwo pockets are brought into registry the pellet disposed in theconveying pocket 6I is discharged by gravity into the pocket 53 of theanvil 4I. In this regard it is pointed out that the size of the anvilpocket 53 is preferably such that it will not accommodate more than onetip pellet. Accordingly, if the pocket 53 is already loaded, the pelletheld in the conveying pocket il ls retained therein during continuedoperation of the machine until the deposited pellet is used in tipping anib. During continued rotation of the cam 1I pellets are automaticallyfed one by one to the receiving pocket 53 of the anvil il, in a mannerclearly apparent from the above explanation. From this explanation itwill be noted that the movement of the slide 51 is synchronized with themovement of the nib holder I2 so that the receiving pocket 53 is loadedwhile the nib holder l2 occupies its loading position, and the end ofthe slide 51 is retracted from its tip loading position as the nibholder i2 is brought downward into its tipping position. Moreover, thissynchronous relationship between the movement of the nib holder I2 andthe loading slide I1 is not disturbed by changes in the operating speedof the machine, as will be apparent from a consideration of themechanical linkages utilized 4to correlate the movements of the twoelements.

The purpose of providing the yielding connection 81 between the lever 13and the plunger Il is substantially apparent from the above explanation.In this regard it will be understood that if the slide 51 should belocked against movement relative to the base member 41, or the movementof the slide toward its discharge position should partially be blocked,the part 31a is telescoped over the part 81h of the connection l1against the action of the spring 81c to permit the continued rotation ofthe cam 1I. In other words, the motion of the arm 13 which cannot beused in moving the slide 51 is taken up in the yielding connection 81without unduly straining the parts of the machine. The pellet feedingdevice and the other parts of the machine are thus further safeguardedagainst breakage.

As will appear from the preceding description, the operation of thevarious parts of the apparatus, including the control relays of thecircuit equipment, are so correlated that the tipping of nibs may beaccomplished at different speeds without disturbing the synchronousrelationship between the various parts ci the apparatus. In thisconnectionit is also indicated above that the cycle counter 3| may beused in lieu of the slow-to-release relay 26 and the cam controlledinterrupter springs 21, for the purpose of controlling the contactor 22to close and open the welding circuit. This cycle counter is providedwith a control relay, not shown, having contacts which connect theconductors I2 and 33 together at spaced intervals, and for periods ofuniform duration. Preferably, the counter is of the type which counts apredetermined number of cycles of the alternating voltage impressed uponthe input terminals thereof to measure a spacing interval; energizes thecontrol relay to connect theitwo conductors 32 and Il together; countsan additional predetermined number of cycles to measure a weldinginterval; and deenergizes the control relay to disconnect the twoconductors 32 and 33 from each other. 'I'his operating cycle iscontinuously repeated under the control of the thyratron tubesconventionally embodied in the counter. Provisions are made for manuallycontrolling the circuit constants of the counter. so

that the spacing periods during which the control relay of the counteris restored, aswell as the extent of each welding period when thecontrol relay is operated, may be varied at will. Provisions are alsomade whereby the entire cycle pattern followed by the control relay maybe shifted along a timeaxis through manual adjustment of the circuitconstants of the counter. This latter adjustment permits the relayoperations to be synchronized with the movement of the head il to closethe contacts Il of the switch Il. By -virtue of this arrangement, thecontacter 22 may be made to operate immediately after the nib holder Ilis operated to its tipping position, and the extent of the weldingperiod may be ilxed at any desired value which is independent ofmovement of the nib holder l2. It will be understood from the aboveexplanation that when the cycle counter 3l is used, certain manualadjustments are required in order to synchronize the operation of thecontactar 22 with the movement of the nib holder Il, each time theoperating speed of the tipping machine Il is changed. This may readilybe accomplished by observing the operation of the machine.

While there has been described what is at present considered to be thepreferred embodiment of the invention, it will be understood thatvarious modifications may be made therein, and it is contemplated tocover in the appended claims all such modiilcations as fall within thetrue spirit and scope of the invention.

I claim:

l. In a machine for tipping metal bases with metal tips, a tip holderprovided with a tip receiving pocket of such dimensions that it willonly accommodate one tip of a given size, a hopper for receiving tippingmaterial and provided with a discharge opening, a slide normally closingsaid opening and provided with a conveying pocket, the thickness of saidslide being such that said conveying pocket will only accommodate onetip of said given size, and means for moving said slide to bring saidconveying pocket alternately into register with said discharge openingand said tip receiving pocket.

2. In a machine for tipping metal bases with metal tips. a tip holderprovided with a tip receiving pocket of such dimensions that it willonly accommodate one tip of a given size, a hopper for receiving tippingmaterial and provided with a discharge opening, a conveyor normallyclosing said opening and provided with a conveying pocket, the thicknessof said conveyor being such that said conveying pocket will onlyaccommodate one tip of said given size, and means for operating saidconveyor to bring said conveying pocket alternately into register withsaid discharge opening and said tip receiving pocket.

3. In a machine for tipping metal bases with metal tips, a support, atip holder carried by said support and provided with an end having a tipreceiving pocket therein, said tip receiving pocket being of suchdimensions that only one tip of a given size may be deposited therein, ahopper for receiving tipping material and provided with a dischargeopening, a slide plate mounted on said support and including a slidingsurface disposed substantially flush with the tip receiving end of saidholder, a slide supported for reciprocating movement over said surfaceand normally closing said discharge opening. said slide being providedwith a conveying pocket.

the thickness ot said slide being such that said conveying pocket willonly accommodate one tip of said given size, and means for reciprocatingthe slide to bring the conveying pocket thereof alternately intoregister with said discharge opening and said tip receiving pocket.

4. In a machine for tipping metal bases with metal tips, a support, atip holder carried by said support and provided with an end having a tipreceiving pocket therein, a hopper for receiving tipping material andprovided with a discharge opening, a slide plate mounted on said supportand including a sliding surface disposed substantially flush with thetip receiving end of said holder, a slide supported for reciprocatingmovement over said surface and normally closing said discharge opening,said slide being provided with a conveying pocket, the slides and slideplates used in said machine being interchangeable in pairs each havingthe same combined thickness but comprising elements having differentrelative thicknesses, means for holding said tip holder in differentpositions in order to maintain the flush relationship between the tipreceiving end thereof and the sliding surface of the slide plateregardless of the thickness of the slide plate in use, and means forreciprocating the slide in use to bring the conveying pocket thereofalternately into register with said discharge opening and said tipreceiving pocket.

5. In a machine for tipping metal bases with metal tips, a supportprovided with an opening extending vertically therethrough and a slidechannel of given depth extending transversely therealong andcommunicating with the upper end of said opening, a tip holder supportedwithin said opening and provided at its upper end with a pocket forreceiving pellets of tipping material, a pellet hopper carried by saidsupport above said channel and provided with a discharge opening in thebottom wall thereof, a slide plate disposed in the bottom of saidchannel and having an upper sliding surface disposed substantially flushwith the upper end of said holder, a slide supported for reciprocatingmovement over said surface and normally closing said discharge opening,said slide being provided with a pellet conveying pocket extendingthrough the thickness thereof, and means for reciprocating the slide tobring the conveying pocket alternately into register with said dischargeopening and said tip receiving pocket,

6. In a machine for tipping metal bases with metal tips, a supportprovided with an opening extending vertically therethrough and a slidechannel of given depth extending transversely therealong andcommunicating with the upper end of said opening, a tip holder supportedwithin said opening and provided at its upper end with a pocket forreceiving pellets of tipping material, a pellet hopper carried by saidsupport above said channel and provided with a discharge opening in thebottom wall thereof, a slide plate disposed in the bottom of saidchannel and having an upper sliding surface disposed substantially flushwith the upper end of said holder, a slide supported for reciprocatingmovement over said surface and normally closing said discharge opening,said slide being provided with a pellet conveying pocket extendingthrough the thickness thereof, the slide and slide plates used in saidmachine being interchangeable in pairs each having the same combinedthickness which is slightly less than the depth of said channel and eachcomprising elements of different relative thicknesses, thereby to adaptsaid machine to handle pellets of different sizes, means for holdingsaid tip holder in said first-named opening in different verticalpositions in order to maintain the flush relationship between the tipreceiving end thereof and the sliding surface ofthe slide plateregardless of the thickness of i the slide plate in use, and means forreciprocating the slide in use to bring the conveying pocket thereofalternately into register with said discharge opening and said tipreceiving pocket.

'7. In a machine for tipping metal bases with metal tips, a tip feedingmechanism comprising a support, a tip holder carried by said support,

a tip hopper carried by said support, said tip hopper being disposedabove and laterally offset with respect to said tip holder, a laterallydisposed channel formed in said vsupport and extending between thebottom of said tip hopper and the top of said tip holder, a slidearranged in said channel and having a tip conveying pocket formedtherein, said slide having a retracted position wherein said tipconveyingpocket is disposed in registry with the bottom of said tiphopper and an extended position wherein said tip conveying pocket isdisposed in registry with said tip holder, said tip conveying pocketbeing adapted to receive a single tip fed by gravity thereto from saidtip hopper when said slide occupies its retracted position, said tipholder being adapted to receive a tip fed by gravity thereto from saidtip conveying pocket when said slide occupies its extended position, andmeans for reciprocating said slide between its two positions.

OTTO JENDRESEN.

